© Edwards Limited 2014. All rights reserved. Page 3
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Introduction
A366-04-880 Issue A
1.2 Description
The Edwards rotary vacuum pump is shown in Figure 1. Refer to Figure 1 for item numbers in brackets in the following
descriptions.
The E2M175 and E2M275 pumps are two-stage oil-sealed, high-vacuum pumps designed for reliable, long-term
operation in both laboratory and industrial environments. A four-pole three-phase motor provides direct-drive
through a flexible coupling. The pumps are free-standing mounted on steel runners.
These pumps are not suitable for use with Hazardous substances. These would include:
Pyrophoric gases
Oxygen >25% unless filled with PFPE oil
Chemically Active e.g. Azide forming compounds
Corrosive gases
Flammable mixtures
The E2M pumps are two-stage, oil-sealed, sliding-vane vacuum pumps.
Lubrication is provided by a sliding-vane oil pump. Oil is drawn into the pump through a wire mesh strainer. The oil
is pumped to a spring-loaded distributor valve. The distributor valve directs a lightly-pressurised supply of oil to the
main vacuum-pump and by-passes the excess back to the oil reservoir. Some of the excess oil is re-directed through
a large area, fine-pore filter and some through a relief-valve. When the pump is switched off, the spring-loaded
distributor valve provides oil and air suckback protection.
You can inspect the level and condition of oil in the oil box through an oil-level sight-glass (9). An oil filler-plug (3)
is fitted at the top of the oil box. An oil drain-tap (10) is fitted at the bottom of the oil box.
The pump has an inlet-port (5) with an ISO63 flange and an outlet-port (4) with an ISO40 flange. Connections for an
external oil-filter are provided (2) (these are not shown in Figure 1); external oil-filter (outlet) is the top connection
and the external oil-filter (return) is the lower connection.
The gas-ballast control (1) allows you to control the introduction of gas-ballast when pumping high vapour loads.
Refer to Section 1.3 for more information about gas-ballast.
Your pump is water cooled. Edwards recommend that you use a thermostatic controlled valve to regulate water flow.
This will ensure optimum pump working temperature, maintain economies in water use, and provide assistance with
gas-ballast protection. The thermostatic control valve is an accessory, refer to Section 7.
Refer to Section 7 for details about vibration isolators and other recommended accessories.
1.3 Gas ballast
To pump high vapour loads, gas-ballast is delivered into the pump to prevent condensation of the vapour carried by
the pumped gases. This system reduces oil contamination and pump corrosion caused by condensed vapour from the
pumped gases.
You can introduce air or an inert gas into the low vacuum stage of the pump through the gas-ballast inlet (Figure 1,
item 1). A filter/silencer is fitted in the gas-ballast system, to prevent the entry of dust into the pump and to improve
silencing. You can control the gas-ballast either manually or remotely.
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